Oil-based rock debris and kitchen biogas residue collaborative resource treatment method and treatment system

Abstract

The present application relates to the field of environmental protection resource utilization, disclose a kind of oil-based rock flour and kitchen biogas residue collaborative resource processing method and processing system.The oil-based rock flour in the present application is obtained by solid-liquid separation, drying, fine crushing, in powder form, then the kitchen waste is obtained by screening, solid-liquid separation, and the obtained oil and solid phase residue are mixed with oil-based rock flour powder in a certain proportion, and finally dried, formed and cut into pieces as solid fuel;Through the processing system in the present application, oil-based rock flour and kitchen biogas residue are treated respectively, realizing the reasonable combination of the two, and solving the problem that oil-based rock flour and kitchen biogas residue are difficult to handle.The present application can achieve the effects of "reduction, harmlessness and resource utilization" for oil-based rock flour and kitchen biogas residue, and has obvious environmental and economic benefits, which not only greatly reduces the environmental risk of oil-based rock flour, but also further improves the value of resource utilization of kitchen biogas residue and oil-based rock, and contributes to the reduction of carbon emissions in China.

Description

Technical Field

[0001] This invention relates to the field of environmental resource utilization, and in particular to a method and system for the co-processing of oil-based rock chips and kitchen waste biogas residue. Background Technology

[0002] Oil-based drilling cuttings are oil-containing solid waste generated when oil-based drilling fluids are used to create oil and gas "channels." They are classified as hazardous waste (code: HW08) in the "National Hazardous Waste List (2021 Edition)." Direct discharge of these cuttings would cause serious environmental pollution. Currently, the main treatment technologies for oil-based drilling cuttings include solidification and secure landfill, drying technology, physicochemical separation, incineration, high-temperature pyrolysis, and biodegradation. Due to the high cost and low resource recovery rate of these technologies, most exploration companies find the problem of oil-based drilling cuttings extremely challenging.

[0003] Food waste refers to the waste generated in daily life, food processing, catering services, and institutional catering. Studies have shown a direct, positive correlation between the amount of oil in food waste and the amount of vegetable oil and animal products consumed by restaurants. Generally, the amount of waste oil in food waste and grease trap waste accounts for 20%-40% of the total fat from vegetable oil and animal products used in restaurants. Most domestic food waste treatment plants first separate the solid and liquid components on the production line. The separated solid waste is typically used for anaerobic fermentation to produce large amounts of biogas for power generation, while the residue is composted into bio-fertilizer. However, the technology for using food waste biogas residue as bio-fertilizer is not yet mature and has several problems, primarily the impact of salt and oil content in food waste on compost quality. The quality of compost is affected to some extent by factors such as the oil and salt content of the food waste. High-salt compost products will inhibit plant growth, and long-term use can lead to soil salinization.

[0004] Therefore, oil-based rock cuttings and kitchen waste biogas residue are difficult to process or reuse. How to properly handle both is a problem we are currently facing. Summary of the Invention

[0005] The technical problem solved by this invention is to provide a method and system for the co-resource utilization of oil-based rock cuttings and kitchen waste biogas residue to produce fuel.

[0006] The technical solution adopted by this invention to solve its technical problem is: a co-processing system for oil-based rock cuttings and kitchen waste biogas residue, comprising the following steps:

[0007] S1: Solid-liquid separation is performed on oil-based rock cuttings mud to obtain solid rock cuttings; the obtained solid rock cuttings are centrifuged to obtain solid rock cuttings with an oil content of 5% to 10%; the solid rock cuttings obtained after centrifugation are dried and then ground into powder for later use.

[0008] S2: The kitchen waste mixture obtained from screening and processing is centrifuged and dehydrated to obtain kitchen waste slurry with a water content of less than 60%; the kitchen waste slurry is subjected to three-phase separation to obtain grease, biogas residue and biogas liquid, and the obtained grease and biogas residue are used for future purposes;

[0009] S3: Mix the powdered rock fragments obtained in step S1 with the mixture of oil and sludge obtained in step S2 at a volume percentage of 1:2 to 1:5, and then dry the mixture to obtain solid fuel.

[0010] This invention utilizes the unique properties of both food waste biogas residue and oil-based rock fragments to create fuel. Food waste biogas residue, when used alone, has a high ignition point and is difficult to burn, requiring accelerants such as straw and sawdust, and it is also difficult to form into a usable shape. Even after solid-liquid separation, oil-based rock fragments still have a high oil content, typically around 10%, while national regulations require oil-based rock fragments with an oil content below 1% to be used as raw materials for co-processing in cement kilns. The method described in this invention combines the solid phase of oil-based rock fragments with food waste biogas residue. The oil-based rock fragments themselves contain approximately 80% soil, facilitating the formation of a usable fuel that is easy to transport and burn. This invention effectively solves the problem of difficult processing of oil-based rock fragments and food waste biogas residue, allowing for their full utilization.

[0011] Furthermore, in steps S1 and S3, the drying process involves placing the sample in a drying room and drying it with hot air at 110 to 300 degrees Celsius.

[0012] Furthermore, in step S2, the solid biogas residue obtained after the three-phase separation is fed into an anaerobic tank for anaerobic fermentation to obtain biogas.

[0013] Furthermore, in step S2, the temperature of the kitchen waste slurry undergoing three-phase separation is 55–75 degrees Celsius.

[0014] Furthermore, in step S3, a coagulant with a volume percentage of 1% to 5% is added during the mixing process.

[0015] The present invention also includes a co-processing system for oil-based rock cuttings and kitchen waste biogas residue to produce fuel: including a first processing system for processing oil-based rock cuttings and a second processing system for processing kitchen waste biogas residue;

[0016] The first processing system includes a first filtration device, a first centrifuge device, and a first drying device connected in sequence, and also includes a first conveying device for transferring materials between the devices; the first centrifuge device is provided with an oil outlet and a solid residue outlet, and the solid residue outlet is connected to the feed inlet of the first drying device.

[0017] The second processing system includes a second filtration device and a second centrifuge device connected in sequence, and also includes a second conveying device for transferring materials between the devices; the second centrifuge device is provided with a wastewater outlet, an oil outlet, and an oil outlet.

[0018] It also includes a stirring device and a second drying device. The inlet of the stirring device is connected to the outlet of the first drying device, the sludge outlet of the second centrifuge device, and the oil outlet of the second centrifuge device, respectively. The outlet of the stirring device is connected to the inlet of the second drying device.

[0019] Furthermore, the first filtration device includes a sorting sieve; the second filtration device includes a storage tank, and a filter screen is provided at the inlet of the storage tank.

[0020] Furthermore, the second centrifugal device includes a two-phase centrifuge and a three-phase centrifuge, with the discharge port of the two-phase centrifuge connected to the inlet of the three-phase centrifuge.

[0021] Furthermore, the solid slag outlet, the oil outlet, and the oil outlet are each equipped with a discharge valve for controlling the discharge volume.

[0022] Furthermore, it also includes a compressor and a dicing machine, with the discharge port of the second drying device connected to the feed port of the compressor, and the discharge port of the compressor connected to the feed port of the dicing machine.

[0023] The beneficial effects of this invention are as follows: The processing method of this invention involves solid-liquid separation, drying, and fine crushing of oil-based rock fragments to obtain powder. Then, kitchen waste is screened and solid-liquid separated, and the resulting grease and solid residue are mixed with the oil-based rock fragment powder in a certain proportion. Finally, the mixture is dried, shaped, and cut into blocks to produce solid fuel. Through the processing system of this invention, oil-based rock fragments and kitchen waste residue are processed separately, achieving a reasonable combination of the two. This effectively solves the problem of the difficulty in processing oil-based rock fragments and kitchen waste residue, and allows for the full utilization of their combustible fuel properties.

[0024] This invention boasts advantages such as strong economic practicality, simple process, uncomplicated operation steps, and good universal applicability, making it suitable for widespread application as a demonstration technology. Furthermore, this invention achieves the effects of "reduction, harmlessness, and resource utilization" for oil-based rock cuttings and kitchen waste biogas residue, resulting in significant environmental and economic benefits. It not only greatly reduces the environmental risks of oil-based rock cuttings but also further enhances the resource value of kitchen waste biogas residue and oil-based rock, contributing to the reduction of carbon emissions in my country. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the processing system described in this invention;

[0026] The components in the diagram are labeled as follows: First filtration device 1, First centrifuge device 2, First drying device 3, Second filtration device 4, Second centrifuge device 5, Stirring device 6, Second drying device 7, Compressor 8, and Cutter 9. Detailed Implementation

[0027] The present invention discloses a method for the co-processing of oil-based rock cuttings and kitchen waste biogas residue, comprising the following steps:

[0028] S1: Preparation of powdered rock fragments

[0029] First, the oil-based cuttings generated from drilling are pretreated to remove large impurities. Then, they undergo a first centrifugation process to separate the solid and liquid phases, resulting in solid cuttings (a mixture of solid residue and oil). The solid cuttings after solid-liquid separation contain approximately 5% to 10% oil. The solid cuttings are then temporarily stored. The oily wastewater obtained from the first centrifugation is then separated into crude oil and wastewater through a second centrifugation process. The wastewater is treated by a wastewater treatment system to meet discharge standards, while the crude oil is recycled. The solid cuttings in the storage tank are then dried until they become solid blocks, which are then ground into powder for later use.

[0030] S2: Separation of biogas residue and grease from kitchen waste

[0031] Large pieces of debris such as bones, plastics, and food packaging boxes are screened out from the kitchen waste. The screened kitchen waste mixture is then centrifuged to dehydrate it, resulting in a slurry with a moisture content of less than 60%. The dehydrated water is then anaerobically fermented into biogas and wastewater. The wastewater is treated to meet discharge standards, and the biogas is utilized comprehensively.

[0032] After centrifugation and dewatering, the slurry is heated to 55-75 degrees Celsius to facilitate the complete separation of oil and fat. Then, it undergoes three-phase centrifugation to separate wastewater, oil and fat, and solid residue. The biogas slurry is then subjected to anaerobic fermentation to produce biogas, and the oil and fat are used as fuel oil. The residue produced after anaerobic fermentation of solid biogas slurry enters the next process. The purpose of anaerobic fermentation of solid biogas slurry is to make full and comprehensive use of resources and to allow the biogas slurry to undergo anaerobic fermentation to further produce biogas.

[0033] Preferably, in the above process, deodorization treatment needs to be added to the food waste treatment process to avoid the spread of odor.

[0034] S3: Mix, dry, and cut oil-based rock chips, kitchen waste, and kitchen grease into blocks to produce fuel.

[0035] The oil-based rock debris solid residue powder obtained in step S1 is uniformly mixed with the kitchen waste biogas residue solid residue (a mixture of oil and solid residue in a volume ratio of 2:1 to 4:1) obtained in step S2 in a volume ratio of 1:2 to 1:5. During the mixing process, a coagulant of 1% to 5% by volume is added to increase the adhesion between the two substances. After the mixture solidifies, it is transported to a drying room and dried with hot air at 110 to 300 degrees Celsius. The completely dried mixture is then compressed and cut into block solid fuel.

[0036] Example 1

[0037] After removing large debris, the oil-based rock fragments were centrifuged to separate the solid and liquid phases. The resulting solid oil-based rock fragments had an oil content of 8%. The solid residue of the oil-based rock fragments was dried in a 200°C environment for 12 hours. After drying and shaping, it was ground to obtain a powdered solid residue. The kitchen waste, after filtering out large debris, was centrifuged to dehydrate it, resulting in a slurry with a water content of 50%. The treated slurry was heated to 60°C and centrifuged a second time to obtain a mixture of oil and solid residue (mixing ratio of 2.5:1).

[0038] Oil-based rock cuttings solid residue powder and solid slag mixture were uniformly mixed at a volume ratio of 1:3. During the mixing process, 2% (by volume) of coagulant was added. After uniform mixing, the mixture was transferred to a drying environment at 200°C and dried for 12 hours. The dried mixture was then compressed to a density of 2.0 g / cm³. 3 Solid fuel is then cut into blocks to obtain fuel in block form.

[0039] Example 2

[0040] After removing large debris, the oil-based rock fragments were centrifuged to separate the solid and liquid phases. The resulting solid oil-based rock fragments had an oil content of 6%. The solid residue of the oil-based rock fragments was dried in a 250°C drying environment for 8 hours. After drying and shaping, it was ground to obtain a powdered solid residue. The kitchen waste, after filtering out large debris, was centrifuged to dehydrate it, resulting in a slurry with a water content of 55%. The treated slurry was heated to 55°C and centrifuged a second time to obtain a mixture of oil and solid residue (mixing ratio of 3:1).

[0041] Oil-based rock cuttings solid residue powder and solid slag mixture were uniformly mixed at a volume ratio of 1:4. During the mixing process, 1% by volume of coagulant was added. After uniform mixing, the mixture was transferred to a drying environment at 230 degrees Celsius and dried for 10 hours. The dried mixture was then compressed to a density of 1.7 g / cm³. 3 Solid fuel is then cut into blocks to obtain fuel in block form.

[0042] The following description, in conjunction with the accompanying drawings and specific embodiments, further illustrates a method for the co-processing of oil-based rock cuttings and kitchen waste biogas residue according to the present invention.

[0043] like Figure 1 As shown in the figure, the co-processing system for oil-based rock cuttings and kitchen waste biogas residue of the present invention includes a first processing system, a second processing system, a stirring device 6, a second drying device 7, a compressor 8, and a strip cutter.

[0044] Since oil-based rock cuttings are hazardous waste, they are stored in a specially provided temporary storage pool beforehand. The first filtration device 1, the first centrifuge device 2, and the first drying device 3 also include a first conveying device for transferring materials between the devices; the first centrifuge device 2 is provided with an oil outlet and a solid slag outlet, and the solid slag outlet is connected to the feed inlet of the first drying device 3;

[0045] Specifically, the first processing system includes a screw conveyor, a sorting screen, a centrifuge, and a dryer. The screw conveyor inlet is located in a temporary storage tank, the screw conveyor outlet is connected to the sorting screen inlet, the sorting screen outlet is connected to the centrifuge inlet, and the centrifuge solids outlet is connected to the dryer inlet. The screw conveyor feeds oil-based rock cuttings from the temporary storage tank into the sorting screen for screening, removing large impurities. The oil-liquid mixture of oil-based rock cuttings is then fed into the centrifuge for centrifugal separation to remove wastewater and crude oil. The remaining solid rock cuttings are then fed into the dryer for drying.

[0046] The second processing system includes a second filter device 4 and a second centrifuge device 5 connected in sequence, and also includes a second conveying device for transferring materials between the devices; the second centrifuge device 5 is provided with a wastewater outlet, an oil outlet and an oil outlet.

[0047] Specifically, the second treatment system includes a belt conveyor, a filter tank, a two-phase centrifuge, and a three-phase centrifuge. The belt conveyor transports the filtered kitchen waste mixture to the two-phase centrifuge for the first centrifugal dewatering treatment. Then, the dewatered slurry is fed into the three-phase centrifuge for the second centrifugal treatment. During this second centrifugal treatment, the slurry is heated to 55-75 degrees Celsius to facilitate the separation of grease. The slurry obtained by the three-phase centrifuge is centrifuged to separate wastewater, grease, and solid residue, which can be discharged through the wastewater outlet, grease outlet, and sludge outlet of the three-phase centrifuge, respectively.

[0048] It also includes a stirring device 6 and a second drying device 7. The inlet of the stirring device 6 is connected to the outlet of the first drying device, the sludge outlet of the second centrifuge, and the grease outlet of the second centrifuge. The outlet of the stirring device 6 is connected to the inlet of the second drying device 7. The stirring device 6 is a mixer, and the second drying device 7 is a drying device. The dried solid rock chips obtained from the first treatment system, the grease obtained from the second treatment system, and the solid slag are fed into the mixer in a certain proportion and mixed evenly. Then, the mixed material is fed into the drying device in the second drying device 7 for drying. The completely dried mixture is then compressed into shape by a compressor 8 and cut into small pieces by a block cutter 9 to produce block solid fuel.

[0049] The conveying device selects appropriate conveying equipment according to the different states of the materials, such as belt conveyors, screw conveyors, and other conveying devices. Screw conveyors can convey mixed wet materials in slurry state, and screw conveyors can convey powder materials. The various devices in this invention are connected through pipelines.

[0050] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for the co-processing of oil-based rock cuttings and kitchen waste biogas residue, characterized in that, Includes the following steps: S1: Solid-liquid separation is performed on oil-based rock cuttings mud to obtain solid rock cuttings; the obtained solid rock cuttings are centrifuged to obtain solid rock cuttings with an oil content of 5% to 10%; the solid rock cuttings obtained after centrifugation are placed in a drying room and dried with hot air at 110 to 300 degrees Celsius; after drying, they are ground into powdered rock cuttings for later use. S2: The kitchen waste mixture obtained from screening and processing is centrifuged and dehydrated to obtain kitchen waste slurry with a water content of less than 60%; the kitchen waste slurry is subjected to three-phase separation to obtain grease, biogas residue and biogas liquid, and the obtained grease and biogas residue are used for future purposes; S3: Mix the powdered rock fragments obtained in step S1 with the mixture of oil and sludge obtained in step S2 in a volume ratio of 1:2 to 1:

5. Then, put the mixture into a drying room and dry it with hot air at 110 to 300 degrees Celsius to obtain solid fuel.

2. The resource utilization system for co-processing oil-based rock cuttings and kitchen waste biogas residue as described in claim 1, characterized in that: In step S2, the solid biogas residue obtained after the three-phase separation is fed into an anaerobic tank for anaerobic fermentation to obtain biogas.

3. The resource utilization system for co-processing oil-based rock cuttings and kitchen waste biogas residue as described in claim 1, characterized in that: In step S2, the temperature of the kitchen waste slurry undergoing three-phase separation is 55-75 degrees Celsius.

4. The resource utilization system for co-processing oil-based rock cuttings and kitchen waste biogas residue as described in claim 1, characterized in that: In step S3, a coagulant with a volume percentage of 1% to 5% is added during the mixing process.

5. A co-processing system for oil-based rock cuttings and kitchen waste biogas residue, characterized in that: It includes a first treatment system for treating oil-based rock cuttings and a second treatment system for treating kitchen waste biogas residue; The first processing system includes a first filter device (1), a first centrifuge device (2) and a first drying device (3) connected in sequence, and also includes a first conveying device for transferring materials between the devices; the first centrifuge device (2) is provided with an oil outlet and a solid residue outlet, and the solid residue outlet is connected to the feed inlet of the first drying device (3). The second processing system includes a second filter device (4) and a second centrifuge device (5) connected in sequence, and also includes a second conveying device for transferring materials between the devices; the second centrifuge device (5) is provided with a wastewater outlet, an oil outlet and a sludge outlet; It also includes a stirring device (6) and a second drying device (7). The inlet of the stirring device (6) is connected to the outlet of the first drying device (3), the sludge outlet of the second centrifuge device (5), and the oil outlet of the second centrifuge device (5), respectively. The outlet of the stirring device (6) is connected to the inlet of the second drying device (7).

6. The resource utilization system for co-processing oil-based rock cuttings and kitchen waste biogas residue as described in claim 5, characterized in that: The first filtration device (1) includes a sorting sieve; the second filtration device (4) includes a storage tank, and a filter screen is provided at the inlet of the storage tank.

7. The resource utilization system for oil-based rock cuttings and kitchen waste biogas residue as described in claim 5, characterized in that: The second centrifugal device (5) includes a two-phase centrifuge and a three-phase centrifuge, wherein the discharge port of the two-phase centrifuge is connected to the inlet of the three-phase centrifuge.

8. The co-processing system for oil-based rock cuttings and kitchen waste biogas residue as described in claim 5, characterized in that: The solid slag outlet, the oil outlet, and the oil outlet are each equipped with a discharge valve for controlling the discharge volume.

9. The resource utilization system for co-processing oil-based rock cuttings and kitchen waste biogas residue as described in claim 5, characterized in that: It also includes a compressor (8) and a dicing machine (9), the discharge port of the second drying device (7) is connected to the feed port of the compressor (8), and the discharge port of the compressor (8) is connected to the feed port of the dicing machine (9).

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